DX11-Z

This document is an Engineering Change Order Log for the DX11-B module, a component of the PDP-11 Family from Digital Equipment Corporation.

The log details a series of engineering changes, corrections, and improvements implemented between May 1970 and October 1973. Each entry specifies:

• A unique ECO code.
• The date of the change.
• A description of the problem addressed (e.g., glitch pulses, timing issues, noise problems, insufficient IBM address decoding, documentation errors, hardware modifications, power supply changes).
• The correction(s) implemented, which often involve changes to wiring, logic, physical components, or documentation.
• Effectivity details, including in-plant and field retrofitting information, estimated installation time, and required kit contents.

In essence, it's a historical record of fixes and updates applied to the DX11-B, covering functional, hardware, and documentation aspects.